Add Select All on the drupal permissions page.

drupal.perm.admin.checkbox.js

(function ($) {
  var columns = $("#permissions tr.even").first().find("input.form-checkbox").length;

  var heads = $("#permissions thead th");
  for (var i=1; i<columns+1; i++) {
    var cbToggler = $("<input type=checkbox>").data('column', i);
    cbToggler.click(function(e) {
      var checked = this.checked;
      var allCheckboxes = $("#permissions tbody input.form-checkbox");
      for (var n=$(this).data('column')-1; n<allCheckboxes.length; n+=columns) {
        var chkbox = allCheckboxes.get(n);
        chkbox.checked = checked;
      }
    });    
    heads.eq(i).append( $('<div class="checkbox-toggler"/>').append(cbToggler) );
  }
  
  // Also add hover toggling (The Jedi Effect)
  $('input[type=checkbox]').mouseenter(function() {
    $(this).attr('checked', (!$(this).attr('checked') ? 'checked' : false));
  });
});
})(jQuery);